Performance Investigation of Glazing Systems in Combination with Internal Solar Shading

Hedegaard, Jakob ; Iversen, Tore Dahl

4. term

Indoor Environmental and Energy Engineering, Master

2015

2015-06-10

96 pages

In Denmark consulting engineers are getting more and more inclined towards using internal dynamic solar shading devices instead of external static shadings. The main two reasons are that external shading is both highly sensitive to the inclement weather and it often conflicts with the architec- tural design of the building façade. Though when simulating a combined window and internal shading system in the widely used building simulations program, BSim, the solar heat gain of a building is overestimated. The reason for the overestimation is that the shading coefficient is considered constant, whereas in reality it changes depending on the incidence angle of the sun. Therefore this project will focus on estimating a correction factor for the shading coefficient, which can help increase the accuracy of the simulated results in BSim. Since it is not known how a change in window and shading type affects the size of overestimation in BSim, it is chosen to look at two different window types in combination with different types of shading. Thereby it will be possible to investigate if a one general correction factor for all types of win- dow and shading types is sufficient, or weather a unique factor should be made for each combination.

Indvendig solafskærmning ; afskærmningsfaktor ; g-værdi ; reflektans ; absorbans ; transmittans

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